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Server Load Balancer:DescribeMasterSlaveServerGroupAttribute

Last Updated:Mar 04, 2026

Queries the detailed information about a primary/secondary server group.

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RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

  • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

  • API: The API that you can call to perform the action.

  • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

  • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

    • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

    • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

  • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

  • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

slb:DescribeMasterSlaveServerGroupAttribute

get

*loadbalancer

acs:slb:{#regionId}:{#accountId}:loadbalancer/{#loadbalancerId}

  • slb:tag
None

Request parameters

Parameter

Type

Required

Description

Example

RegionId

string

Yes

The region ID of the Classic Load Balancer (CLB) instance.

cn-hangzhou

MasterSlaveServerGroupId

string

Yes

The ID of the primary/secondary server group.

rsp-cige6j******

Response elements

Element

Type

Description

Example

object

RequestId

string

The request ID.

9DEC9C28-AB05-4DDF-9A78-6B0******

Tags

object

Tag

array<object>

The tag list.

object

The tag list.

TagKey

string

The tag key. Valid values of N: 1 to 20. The tag key cannot be an empty string.

The tag key can be up to 64 characters in length, and cannot contain http:// or https://. The tag key cannot start with aliyun or acs:.

TestKey

TagValue

string

The tag value. Valid values of N: 1 to 20. The tag value can be an empty string.

The tag value can be up to 128 characters in length, and cannot contain http:// or https://. The tag value cannot start with acs: or aliyun.

TestValue

LoadBalancerId

string

The ID of the associated CLB instance.

lb-14fadafw4343a******

MasterSlaveServerGroupName

string

The name of the primary/secondary server group.

Group1

MasterSlaveServerGroupId

string

The ID of the primary/secondary server group.

rsp-cige6******

MasterSlaveBackendServers

object

MasterSlaveBackendServer

array<object>

A list of backend servers in the primary/secondary server group.

object

The backend servers in the primary/secondary server group.

Type

string

The type of the backend server. Valid values:

  • ecs (default): Elastic Compute Service (ECS) instance

  • eni: elastic network interface (ENI)

  • eci: elastic container instance

eni

Weight

integer

The weight of the backend server.

100

Description

string

The description of the primary/secondary server group.

The description of the primary/secondary server group.

Port

integer

The port that is used by the backend server.

90

ServerId

string

The ID of the backend server.

eni-hhshhs****

ServerType

string

The type of backend server. Valid values: Master and Slave.

Slave

CreateTime

string

The time when the CLB instance was created. The time follows the YYYY-MM-DDThh:mm:ssZ format.

2022-12-02T02:49:05Z

Examples

Success response

JSON format

{
  "RequestId": "9DEC9C28-AB05-4DDF-9A78-6B0******",
  "Tags": {
    "Tag": [
      {
        "TagKey": "TestKey",
        "TagValue": "TestValue"
      }
    ]
  },
  "LoadBalancerId": "lb-14fadafw4343a******",
  "MasterSlaveServerGroupName": "Group1",
  "MasterSlaveServerGroupId": "rsp-cige6******",
  "MasterSlaveBackendServers": {
    "MasterSlaveBackendServer": [
      {
        "Type": "eni",
        "Weight": 100,
        "Description": "The description of the primary/secondary server group.",
        "Port": 90,
        "ServerId": "eni-hhshhs****",
        "ServerType": "Slave"
      }
    ]
  },
  "CreateTime": "2022-12-02T02:49:05Z"
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.